Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca28b68261702cdf…

MALICIOUS

PDF

82.7 KB Created: 2021-09-10 10:30:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dbfbb1d8a82046d13aa3ca3f2872aa5d SHA-1: 1cc3191d739b872193bbc28fa0970952c4180639 SHA-256: ca28b68261702cdff4c1023b95abe55af0edd5ab611ba041c9d4900125ca8d8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links indicate an attempt to redirect users to malicious content, likely exploiting a vulnerability or attempting social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://innova-perila.ru/upload/files/rerevigo.pdf In PDF document text
    • http://madmojo.com/fckupload/file/widami.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/fdebd7f2f25ff173d64ef64c6a0e2a6a/85506672813.pdfIn PDF document text
    • http://ondamarinarest.com/upload/files/zatatolap.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/sqevek39ovt6bn5i5cr1lqqv4s/fomigazuxo.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/5febccff782169f84ddbfdb5c1108a5a/7820377637.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/lorulorelumupodizuzi.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16131bce64a1e1---7641981389.pdfIn PDF document text
    • https://toocapen.com/files/8427891749.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b95fd45db---xogalu.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/55034351745.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/c99e88bfb76bf0f6df085af344453cee/lemipisugefaxoburep.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ea3709244---4807084291.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/zugatofaxe.pdfIn PDF document text
    • http://thietbianninh188.com/uploads/files/pumobolezejisaxerumus.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/58038692364.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/2746297390.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles/file/23670093934.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/lopibamabotofugelakel.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/bokub.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a218d47653---totukuredomomigibikipava.pdfIn PDF document text
    • http://runwellconsulting.eu/file/file/rotivifakutazi.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/25324491574.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613548efbecc9---64376248968.pdfIn PDF document text
    • http://josquin-capella.de/download/tabejigakusab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=fxguru+movie+fx+director+apkPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E5 17520 bytes
SHA-256: f8b151204bb4257a403d782422e7b8c5f3351bb4071c3e5c49e2fb1717cde501
font_02_sfnt_off000123a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A8 10980 bytes
SHA-256: 57926c89f3082a0b326e23027079c22bf066944a9c91c979576e1e2a81d1dd75